PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-13:27:30
G02     229.9          71.8                8.4 +/-    1.28       8.8 +/-    1.28  0.100 / 0.290
G05     175.6          10.4               -6.4 +/-   19.98     -17.7 +/-   19.98  0.120 / 0.290
G06     42.6           65.9                4.6 +/-    0.76       5.0 +/-    0.76  0.030 / 0.060
G12     321.1          46.2                6.3 +/-    1.50       8.4 +/-    1.50  0.050 / 0.050
G17     68.5           23.3                6.6 +/-    1.37      13.5 +/-    1.37  0.110 / 0.130
G19     54.0           40.2                6.9 +/-    1.00      10.0 +/-    1.00  0.080 / 0.140
G24     252.6          37.5                6.6 +/-    1.32      10.1 +/-    1.32  0.020 / 0.040